OpenGL error GL_INVALID_OPERATION in mac file dialog

On MAC OS X Yosemite on QT 5.4 and 5.5:

1) open Qt example "scene graph" (openglunderqml)
2) put it to single thread mode by adding line setenv("QSG_RENDER_LOOP", "basic", 1);
3) create QFileDialog while main window with shader is opened
4) select "All my files" in finder file dialog
5) move scroll area to top and to bottom using two fingers on touchpad
6) got OpenGL crash;

i launched example from OpenGL Profiler and got this crash log:
http://pastie.org/10352515

full overview and code sample http://pastie.org/10352586